It's long been associated with so-called brewer's droop after one too many pints.

But beer can actually make men better in bed, a sex expert claims.

Dr Kat Van Kirk says there are a variety scientific reasons why sinking a few pints can improve a man's performance in the bedroom.

And contrary to popular belief, the Los Angeles-based certified sex therapist believes having a few beers helps men last longer.

Beer can actually boost a man's performance in the bedroom - if consumed in moderation, an expert claims

Beer is full of phytoestrogens from the alcohol - and these are scientifically proven to delay orgasm, she told the website askmen.

And it's good news for men who prefer dark beers, such as porters and stouts - as they can expect a boost in libido and longer, more intense erections, she adds.

This is due to the high amounts of iron which increases the amount of red blood cells and flow to the penis.

The marriage and family therapist then refers to a study by Italy's Fondazione di Ricerca e Cura, which found that a pint a day reduces the risk of heart disease or stroke by a third, compared to abstaining.